Introduction of Core pakage

1. geoos: supports all spatial data types in OGC
2. planar: supports basic GIS operations for spatial data, which can perform intersecting, creating buffers, calculating statistics, performing neighborhood analysis, and more
3. encoding: including the conversion between wkt and wkb
4. geocsv: Geocsv data analysis
5. geojson: Geojson data analysis and conversion
6. grid: supports square and hexagonal division
7. measure: Spatial data measurement